Binding post



1 646,896 Oct. 25, 1921., v a D TUSKA BINDING POST Filed July 21, 1.924

INVENTOR ATTORNEYS Patented Oct. 25, i927.

UNITED STATES 1, 646,890 PATENT OFFICE- CLARENCE TUSKA, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE C. D. TUSKA COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

BINDING POST.

Application filed July 21,

This invention relates to binding posts such as are used for making electriealconnections and particularly to that type of a binding post wherein the connection ismade by securing the conductor to the post bymeans of a thumb nut threaded on the post. The invention finds a useful application more particularly in instances wherein binding posts are to be secured to or mounted upon a panel or plate of'hard material such as a phenol condensation product.

One object of the invention is to improve a binding post of the above type so that after the post is properly assembled upon the panel it will not become loosened by repeated changes of the electrical connections.

Another object is to provide an improved binding post which is easily and convenient ly assembled upon the panel.

With these and other objects in view, my invention consists in employing with a binding post of the type above set forth a new and useful collar for same, the advantages of which will appear in the following de tail description and drawings in which:

Fig. 1 is a side view of my improved col lar' Ihg. 2 is a plan view of the lower face of same;

Fig. 3 is a side view of a binding post assembled upon a panel and embodying my improved device; and

Fig. 4 is a section taken through the line 44 in Fig. 3.

Referring to the drawings, Fig. 3 repre sents a binding post of the type above referred to which consists of a screw 1 having a slotted head 2, passing through an aperture 3 formed'in a panel or plate Lof the usual hard insulating material and secured thereto bymeans of a collar 5 threadedly engaged by the screw 1. In assembling the post on the panel, the head 2 of the screw is turned up against the lower side of the panel 4 so that the collar 5 is drawn tightly against the upper side of the panel whereby the screw is rigidly secured to the panel. The screw 1 is provided with the usual thumb nut 6 which binds a conductor or Wire such as W to the post when the nut is turned up.

Thus far I have described a binding post of a commonly known construction and before proceeding with a detailed description of my improved post I will set forth a few of the diiiiculties and objections experienced 1924. Serial No. 727,172.

- the post to the panel and in a great many instances the screw head is often in an inaccessible place and it is a diflicult operation. This is especially true in radio receiving sets. Also in assembling or tightening a binding post on a panel it is necessary to hold the collar from turning while the screw head is turned up because the collar will turn with the screw. In holdingthe collar by means of pliers or'a similar tool, the surface of the collar is marred and furthermore this opervide cutting teeth for the purpose to be later described. The outside diameter thereof is slightly greater than the diameter of the aperture 3 in the panel 4. The cutting edges of the knurled portion 7 are of such character that upon forcing the same by pressure into the aperture of the panel said edges will cut their own way through the sides of the aperture and form an interlocking engagement therewith sufiicient to resist all ordinary tendency to turn after the post is once securelymounted i It will be thus seen that when the post is'assembled on the panel and the screw 1 is turned up, that the port-ion 7 of the collar 5 may be drawn into the aperture 3 of the panel 4 and that the cutting edges or teeth on the portion 7 will bite into the sides of ation requires the use of a tool in each hand edges will cut themselves into interlocking on, I 4:131

engagement with the wall of said aperture, wherebythe collar will be held or locked from turning relatively to the panel or with thesorew while the latter is being turned up.

While the knurled portion 7 may thus be drawn into the aperture by turning up the screw 1 it might also be forced by pressure down into the seat in the aperture before turning up said screw.

It will also be observed after the screw and collar are thus assembled upon the panel and a conductor is fastened to the assembly by the thumb nut, that any turning of the collar is prevented when the thumb nut is loosened or tightened up thereby providing a binding post which always remains tightly secured to the panel. 7

A still further advantage of my improved binding post is that any turning of the thumb nut after a conductor is securely fastened to the post will tend to still further tighten the" post to thepanel. The collar being prevented from turning, the binding or freezing of the parts due to the tightness of the connection will be between the thumb nut, conductor and the screw, and if the thumb nut is turned off while this binding action occurs, such a turning will tend to turn the screw in a direction which will tighten the screw head against the lower face of thepanel and draw the collar still tighter against the upper face of the panel. If the thumb nut is turned down to make a still tighter connection and any binding action takes place tending to turn the screw, such a turning of the screw would tend to unscrew it from the collar on the panel, but

not

before any such action can occur the lower face of the thumb nut engaging the'upper face of the collar or the interposed conductor will prevent any movement of translation of said screw which would be necessary be fore the screw could turn out of said collar an l=thercfore thebinding post will remain tight on the panel.

I have thus provided by a simple and in comprising a stem extending through said aperture with a head at one side of said support, a clampingcollar scr'ew threadedly engaged upon said stem at the other side of said support for clamping the binding post to said support, said collar having a reduced annular projecting portion provided with cutting edges adapted to be forced by pressure into a self-cutting interlocking engagement with the wallof said aperture to pre vent turning movement of said collar relatively to said support, a clamping nut screw threadedly engaged upon the outer end of said stem and an electrical conductor clamped between said collar and nut.

In testimony whereof I have aflixed my signature.

CLARENCE n. TUSKA. 

